If I'm extra stressed, depending on the sort of stress, the best de-stressor I know is a good cry - in the pre-dd days I'd put some weepy music on, or a soppy film. Alternatively beating up some cushions can be relaxing ultimately or putting on some very loud music and dancing around (out of sight of neighbours).
If I just want to unwind a bit, flop on sofa with book...call a friend...watch tv...make myself a 'grown up' non-alcoholic drink (tonic water, fizzy water with ginger/elderflower/cranberry, cup of tea etc)...take a bath/shower...go for a walk.
Stretch, do a few exercises...sit somewhere I never usually sit in the house...
And, good for you - may you reap the benefits [smile}